Adjustable abdominal exercise apparatus



FIG. 1 is an isometric view of an adjustable abdominal exercise apparatus according to the present invention;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a back elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a front elevational view thereof. 

The ornamental design for an adjustable abdominal exercise apparatus, as shown and described. 